separate the rest of general drawing code

src/rendering/twn_draw_c.h

@@ -113,6 +113,73 @@ typedef struct TextCache {
 } TextCache;
 
 
+/* TODO: try using the fact we utilize edge coloring and step virtual color attributes to bogus points */
+/*       this is only doable is we take out color attribute to separate array or a portion of it */
+/* interleaved vertex array data */
+typedef struct ElementIndexedQuad {
+    /* upper-left */
+    Vec2 v0;
+    Vec2 uv0;
+    Color c0;
+    /* bottom-left */
+    Vec2 v1;
+    Vec2 uv1;
+    Color c1;
+    /* bottom-right */
+    Vec2 v2;
+    Vec2 uv2;
+    Color c2;
+    /* upper-right */
+    Vec2 v3;
+    Vec2 uv3;
+    Color c3;
+} ElementIndexedQuad;
+
+
+typedef struct ElementIndexedQuadWithoutColor {
+    /* upper-left */
+    Vec2 v0;
+    Vec2 uv0;
+    /* bottom-left */
+    Vec2 v1;
+    Vec2 uv1;
+    /* bottom-right */
+    Vec2 v2;
+    Vec2 uv2;
+    /* upper-right */
+    Vec2 v3;
+    Vec2 uv3;
+} ElementIndexedQuadWithoutColor;
+
+
+typedef struct ElementIndexedQuadWithoutTexture {
+    /* upper-left */
+    Vec2 v0;
+    Color c0;
+    /* bottom-left */
+    Vec2 v1;
+    Color c1;
+    /* bottom-right */
+    Vec2 v2;
+    Color c2;
+    /* upper-right */
+    Vec2 v3;
+    Color c3;
+} ElementIndexedQuadWithoutTexture;
+
+
+typedef struct ElementIndexedQuadWithoutColorWithoutTexture {
+    /* upper-left */
+    Vec2 v0;
+    /* bottom-left */
+    Vec2 v1;
+    /* bottom-right */
+    Vec2 v2;
+    /* upper-right */
+    Vec2 v3;
+} ElementIndexedQuadWithoutColorWithoutTexture;
+
+
 /* renders the background, then the primitives in all render queues */
 void render(void);